Chemical Effect of Current
Trending Questions
- wire
- switch
- bulb
- iron nail
The bulb in the given electrical circuit does not glow even after the switch is turned ON. Which of the following could be a possible reason for this?
- Bulb is fused.
- Solution is non-electrolytic.
- Connections are faulty.
- Battery is weak.
Is rainwater a good conductor of electricity?
Passage of electric current through a conducting solution causes ____________.
chemical change
physical change
no reaction
temperature drop
- Tester
- Bulb
- LED
- Battery
In the circuit given as figure, Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore, she took a carbon rod as the negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.
- The silver spoon should be connected to the Positive terminal of the circuit.
- The silver spoon should be connected to the Negative terminal of the circuit.
- We should use Copper Sulphate as the solution.
- The thickness of the Silver Spoon keeps on increasing as it gets electroplated.
- 1 and 2
- 2 and 4
- 1, 2, 3 and 4
- 1, 2 and 3
If electrodes were immersed in water, and a current was passed, is the change taking place in the solution a chemical change? Give reason.
[ 3 MARKS ]
An electric current is passed through a conducting solution. List any three possible observations.
There is a sample of water. However it is unknown if the sample is that of pure distilled water or it contains salts and other impurities. Can you determine if it will conduct electricity or not with just the given information?
Yes
- No
Can't be said
- Depends on temperature of water
- tester
- barometer
- odometer
- Mechanical to light
- Chemical to electrical
- Electrical to chemical
- Electrical to mechanical
What makes tap water a fairly good conductor of electricity?
Its temperature
Dissolved salts
Its property of being a universal solvent
None of these
(i) Deposits of metal may be seen on the electrodes.
(ii) Solution may get heated.
(iii) Bubbles of gas may be formed on the electrodes.
- Only (ii) is true.
- Only (i) and (ii) are true.
- Only (i) and (iii) are true.
- All (i), (ii) and (iii) are true.
Most liquids that conduct electricity are solutions of _.
A dry cell converts _______ into ________.
- Current is passed from zinc rod to copper rod.
- Electrical energy is converted into chemical energy .
- Copper electrodes begin to dissolve in the sulphuric acid.
- Bubbles are formed on the copper rod.
- True
- False
Which of the following effects can occur on passage of electric current through a conducting solution?
Bubbles of a gas may be formed on the electrodes
Deposits of metal may be seen on electrodes
- Change of colour of solutions may occur
All of these
Which of the following converts chemical energy into electrical energy?
Car engine
Dry cell
Battery
Both (b) and (c)
(i) Deposits of metal may be seen on the electrodes.
(ii) Solution may get heated.
(iii) Bubbles of gas may be formed on the electrodes.
- Only (ii) is true.
- Only (i) and (ii) are true.
- Only (i) and (iii) are true.
- All (i), (ii) and (iii) are true.
Passage of electric current through a conducting solution causes ____________.
chemical changes
physical changes
no change
temperature drop
Paheli set up an experiment using liquid A in the beaker as shown in Fig. She observed that the bulb glows. Then she replaced liquid A with another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb with an LED. They observed that the LED glows. Explain.
There is a sample of water. However it is not known if it is pure distilled water or contains salts and other impurities. Can you determine if it will conduct electricity or not with just the given information?
- No
Yes
Can't be said
- Depends on temperature of water
- tester
- barometer
- odometer
- True
- False
